The paint in certain container is sufficient to paint an

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The paint in certain container is sufficient to paint an area equal to dimensions 22.5 cm x 10 cm x 7.5 cm can be painted out of this container ?

1. 100
2. 200
3. 50
4. 175

Correct Option: A

Surface area of 1 brick
= 2 (lb + bh + lh)
= 2(22.5 x 10 + 10 x 7.5 + 7.5 x 22.5)
= 2(225 + 75 + 168.75)
= 2 x 468.75 = 937.50 cm²
= 93750/(100 x 100) = 0.09375 sq m
∴ Number of bricks = Total area/Surface area of 1 brick
= 9.375 / 0.09375 = 100